Toyota 4runner 1995

Asked by May 17, 2016 at 11:16 AM about the 1995 Toyota 4Runner 4 Dr SR5 V6 SUV

Question type: Maintenance & Repair

When i take of oil cap while truck is on the
engine settles down, unwinds almost as it's
about to go off but doesnt when i put it back
on it gets loud sgain

2 Answers

18,895

Check your PCV (positive crankcase ventilation) valve. Sounds like you're building up too much pressure in the crankcase and opening the oil filler cap is relieving it.

775

Definitely blocked PCV- those 5vz/ 3vz motors are known for PCY blockage- the best solution is to remove the PCV, drill it out, replace it, and install an oil blow-by-catch-can.

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